| 摘要 |
A light weight, high strength carbon fiber golf club shaft (11) includes inner (1), intermediate (2) and outer (3) tubular layers formed of carbon fiber-reinforced plastic. The intermediate layer (2) is formed of high modulus, high strength carbon fibers having a modulus of 35000 kg/mm<2> or more while the outer layer (3) is formed of high strength carbon fibers having a modulus of 23000-30000 kg/mm<2>. The carbon fibers of the intermediate (2) and outer (3) layers are oriented at an angle in the range of 0 to 15 degrees with respect to the longitudinal axis of the shaft (11), while the carbon fibers of the inner layer (1) are oriented at an angle of 30 to 80 degrees. The weight ratio of the intermediate layer (2) to the outer layer (3) ranges from 15:85 to 50:50, and the weight of the inner layer is 30-60 % by weight based on the total weight of the three layers. The shaft (11) has a rigidity of 220-240 cycles per minute in terms of frequency and a weight of 63 g or less in the axial length of 1143 mm from the tip end. <IMAGE> |
